热障涂层金属粘结层的制备工艺影响涂层的微观组织结构及性能.采用活性燃烧-超音速火焰喷涂(AC-HVAF)和传统超音速火焰喷涂(HVOF)2种工艺喷涂制备NiCoCrAlTaY粘结层,并对2种粘结层的组织结构及高温氧化性能进行对比.结果表明:AC-HVAF喷涂层表面半熔颗粒的尺寸为(13.242±1.392) μm,孔隙率为(1.34±0.18)％,氧含量为0.630％,表面粗糙度为(10.12±0.36) μm;HVOF喷涂层表面半熔颗粒的尺寸为(19.438±2.413) μm,孔隙率为(5.96±2.11)％,氧含量为2.300％,表面粗糙度为(11.35±0.43) μm;AC-HVAF制备的NiCoCrAlTaY金属粘结层高温氧化后表面生成了以仅-Al2O3为主的热生长氧化物(TGO),而HVOF制备的NiCoCrAlTaY金属粘结层高温氧化后表面生成了以Cr-Ni复合氧化物为主的TGO,AC-HVAF制备的金属粘结层具有更优异的抗氧化性能.
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